27777811844 has 18 divisors (see below), whose sum is σ = 51638858250. Its totient is φ = 13071910912.

The previous prime is 27777811813. The next prime is 27777811903. The reversal of 27777811844 is 44811877772.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6940889344 + 20836922500 = 83312^2 + 144350^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 27777811844.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12013469 + ... + 12015780.

Almost surely, 2^27777811844 is an apocalyptic number.

It is an amenable number.

27777811844 is a deficient number, since it is larger than the sum of its proper divisors (23861046406).

27777811844 is a wasteful number, since it uses less digits than its factorization.

27777811844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24029287 (or 24029268 counting only the distinct ones).

The product of its digits is 4917248, while the sum is 56.

The spelling of 27777811844 in words is "twenty-seven billion, seven hundred seventy-seven million, eight hundred eleven thousand, eight hundred forty-four".